Anonymous have strongly denied being behind these attacks & the data theft. Anonymous were only behind the DDoS attacks which are unrelated to the data theft, again reread Sonys response.
Sony have only said the DDoS attacks made it easier for the server intrusion to go undetected, the rest is all hype and has been taken out of context. I suggest rereading the original documents and press releases again and not the media's interpretation of the releases, nowhere do Sony actually blame anonymous for the theft7. Have you identified the individual(s) responsible for the breach?
Also a shiny new breach for Sony, data stolen containing names and addresses of 25000 sweepstakes competition entrants from 2001: http://www.reuters.com/article/2011/05/07/sony-idUSL3E7G701T20110507
I wonder how they're going to justify storing that info for 10 years